How does node+vue implement a simple WebSocket chat function? (code example)

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I recently learned about websocket instant messaging and I feel it is very powerful. Here I used node to start a service for websocket link, and then linked it in the view of vue for communication. Without further ado, let’s go directly to the code.

First of all, I need to use node’s nodejs- websocket module

Use yarn to install

yarn add nodejs-websocket --save

Of course, you can also use npm to install

npm i nodejs-websocket --save

After the installation is completed, we start writing the server code. First, I use node has a node server locally to start the websocket service

sock.js:

let ws = require("nodejs-websocket");
console.log("开始建立链接");
ws.createServer(function (conn) {
  conn.on("text", function (str) {
    console.log("收到的信息为", str);
      conn.send(`${str}（机器人`)
  });
  conn.on("close", function (code, reason) {
    console.log("关闭连接")
  });
  conn.on("error", function (code, reason) {
    console.log("异常关闭")
  })
}).listen(8001);
console.log("链接建立完毕");

The server mainly uses nodejs-websocket to start the service and return the values ​​required by the front end. Here I just did a simple process, adding a 'robot' string after the acceptance value,

Then, we need to start the node service,

The path behind the command must be found correctly. I placed sock.js under the socket folder in the root directory.

Execute

yarn socket

Finally, look at our client. On the client side, I want to have an input box and then a chat box:

<template>
  <p class="test3">
    <p class="msg" ref="box">
      <p v-for="item in list" :class="[item.type,&#39;msg-item&#39;]">
        <p>
          {{item.content}}
        </p>
      </p>
    </p>
    <p class="input-group">
      <input type="text" v-model="contentText">
      <button @click="sendText">发送</button>
    </p>
  </p>
</template>

<script>
  export default {
    name: "index3",
    data() {
      return {
        list: [],//聊天记录的数组
        contentText: "",//input输入的值
      }
    },
    methods: {
      //发送聊天信息
       sendText() {
        let that = this;
        this.list = [...this.list, {type: "mine", content: this.contentText}];//通过type字段进行区分是自己（mine）发的还是系统（robot）返回的
        this.backText(function () {
          that.contentText = "";//加回调在得到返回数据的时候清除输入框的内容
        });
      },
      backText(callback) {
        let that = this;
        if (window.WebSocket) {
          let ws = new WebSocket("ws://192.168.11.169:8001");
          ws.onopen = function (e) {
            console.log("链接服务器成功");
            console.log("that.contentText is", that.contentText);
            ws.send(that.contentText);
            callback();
          };
          ws.onclose = function (e) {
            console.log("服务器关闭")
          };
          ws.onerror = function () {
            console.log("服务器出错")
          };
          ws.onmessage = function (e) {
            that.list = [...that.list, {type: "robot", content: e.data}]
          }
        }
      }
    },
    watch: {
      //监听list,当有修改的时候进行p的屏幕滚动，确保能看到最新的聊天
      list: function () {
        let that = this;
        setTimeout(() => {
          that.$refs.box.scrollTop = that.$refs.box.scrollHeight;
        }, 0);
        //加setTimeout的原因：由于vue采用虚拟dom，我每次生成新的消息时获取到的p的scrollHeight的值是生成新消息之前的值，所以造成每次都是最新的那条消息被隐藏掉了
      }
    },
    mounted() {
    }
  };


</script>

<style scoped lang="scss">
  .test3 {
    text-align: center;
  }

  .msg {
    width: 100px;
    height: 100px;
    overflow: auto;
    padding-top: 5px;
    border: 1px solid red;
    display: inline-block;
    margin-bottom: 6px;

    .msg-item {
      position: relative;
      overflow: hidden;
      p {
        display: inline-block;
        border-radius: 40px;
        background: #3C3D5A;
        color: white;
        float: left;
        padding: 2px 12px;
        margin: 0 0 2px 0;
        max-width: 70%;
        text-align: left;
        box-sizing: border-box;
      }

      &.mine {
        p {
          float: right;
          background: aquamarine;
          color: white;
        }
      }
    }
  }

</style>

Let’s take a look at the final effect:

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